Near Guymon, OklahomaMost storms move fast. This one crept over a farming community for more than an hour, bristling with electricity. "No two storms are the same," says James LaDue, a meteorologist at the National Weather Service. "No two skies are either."

Near Clayton, New MexicoIt's not a hovering spaceship. It's a low-precipitation supercell—"one of the prettiest sights in the severe-weather world," says storm chaser Roger Hill. Photographer Mitch Dobrowner says they tracked this one 300 miles from the Texas Panhandle.

Moorcroft, Wyoming"I will never forget the sight of this monster hailstorm as it breached the hills right in front of us," says Dobrowner. "It came at us at about 40 miles an hour, raining golf-ball-size hail." After taking six shots, he and storm chaser Roger Hill dashed for their van when "it became obvious this was no ordinary storm." National Weather Service meteorologist James LaDue confirms that it was a supercell.

Mobridge, South DakotaThe striated layers of rotating cloud that surround an updraft are a supercell signature. But what captivated Dobrowner about this storm was something more primal and figurative. "It was like watching a monster in the dark," he remembers. "We weren't able to see it until a series of lightning bolts rained down. Then it was like watching a dragon in the night sky."

Lake Poinsett, South DakotaDobrowner and Hill were ready to give up on this supercell as they watched it weaken. But after "it pulsed up and began to show signs of cycling," says Dobrowner, they moved close to these fields, at one point getting within a hundred yards of a rotating, lowering cloud. The storm eventually passed. It "never did produce a tornado," says Hill, "but it certainly tried."

Buffalo, South DakotaOnce a violent supercell, this storm had begun to die when it changed form and surged back to life. Hill remembers it emitting a lot of hail and lightning that lasted well into the night. LaDue notes that from this point of view—a rare opportunity to glimpse the side of a supercell, rather than seeing it from below—much of the storm's anatomy is visible.